So here's how it works....the brush can be used two ways. First way is to pull off just the pink cap off the tube...the brush will be pulled through a small tube extension on the purple/glitter cap and you will get less product. This can be for separating and lengthening the lashes.
The second way is to pull off both the pink and purple/glitter caps together so the brush is just pulled through the bottle itself like a normal mascara. You get a fuller brush with more product so you can get volume.
I got volume and length and it made my lashes super thick and black. It was the perfect mascara for me! It was actually a GREAT mascara and I HATED that I had to give it back after four weeks! I will be BUYING THIS FOR SURE!!!